Problem generating rig
In Rigify you can control arms and legs in two ways: FK and IK. When using one method the other is temporarily disabled, so it seems to have no effect.
You can decide which to use with the top slider in my example image, where one arm is set to IK and the other to FK: if the slider is set to 0.0 you are using IK, if set to 1.0 FK (Inverse Kinematics - Forward Kinematics).